Auxiliary air inlet



Jan. 7, 1930. E. a. emumun AUXILIARY AIR INLET Filed Nov. 24, 1928 gwoe'nkoz E. fl raumll'cii Patented 7, 1930 UNITED STATES PATENT OFFICE 1 2mm G. GBAUILICH, OF MIAMI, FLORIDA, ASSIGNOR TO-M IT MANUFACTURING COMPANY, OF MIAMI, FLORIDA, A CORPORATION OF FLORIDA AUXILIARY am mLngr Aplilioation flled November 24, 1928. Serial No. 321,717.

This invention relates to auxiliary air inlets for use with internal combustion engines,

transverse and has for an important object thereof the provision of a device of this character which may be readil. and cheaply manufactured and which wil be durable and eflicient in service.

A further object of the invention is to pro vide a construction such that the movements of the valve are unaffected by the intake suction of the engine and accordingly may be practically and accurately governed by a thermostatic control therefor.

These and other ob'ects I attain by the construction shown in t e accompanying drawing, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein Fi re 1 is a side elevation illustrating the appllcation ofjan auxiliary air inlet constructed in accordance with my invention to an internal combustion engine;

Figure 2 is a sectional view through the control element of the air inlet, the parts being shown in solid lines in their operative position and in dotted lines in their normal position.

Referring now more particularly to the drawing, the numeral 10 generally designates a casing having upper and lower oppositely dished walls 11 and 12, the concave faces of which are opposed and the marginal edges of which are secured together and clamp therebetween a flexible diaphragm 13. The lower wall ,11 is formed with a central aperture 14 and with vents 15 to one side of this aperture.

Secured to the lower wall centrally thereof is a casting 18 having a bore 19 aligning with the opening 14 within which is slidably mounted a circular valve body 20 having a ort 21, which is connected at its upper end hiy an operating rod 22 to the center ofthe diaphragm 13. At one side, the

body in diametrical alignment with the port 21 is provided with a tubular boss 23 permitting connection of a conduit 24 which com- -municates with the interior of the intake manifold I of the engine. The walls of the casting from the base of this tubularboss and in diametrical alignment with the port 21 areformed with a transverse port 25 1 which, at the opposite side of the casting from the boss, angles downwardly as at 25" and opens through the bottom of the casting This 1 and the lower wall 11 of the casing. port 25 is vertically spaced from the port 21 when the valve is in the position which it occupies with thediaphragm in its normal position. The port 25 has associated therewith a needle valve 26 controlling the effective size thereof.

In the use of the device, the upper Wall 12 is clamped against the face of the exhaust manifold E of an engine, as indicated at 27 and the conduit 24 is connected with the interiorof the intake manifold I. As the heat of the exhaust manifold increases in operation, the air within the space between the upper wall and diaphragm expands, forcing the diaphragm upwardly and bringing the port 21 of the valve 20 into alignment with the port 25 of the casting. This permits air to pass through the conduit 24 to the intake manifold, but such passage is not possible until the engine has been operating for a sufficient time for it to become properly heated and to prepare it for the reception of auxiliary air. Since the air must be drawn through the vents 15 and accordingly over the heated elements of the thermostatic structure, this air will be heated and its mixture with the gases of the intake manifold thereby promoted. Furthermore, the suction acting below the diaphragm and tending to reduce the pressure below this diaphragm when the air inlet comes into operation, will assist in movement of the diaphragm to its final position and render the thermostatic element less,

liable to fluctuation in operation which often I claim 1. A thermostatically controlled mechanism for the admission of air to the intake manifolds of internal combustion engines, a pair of oppositely dished plates having their concave faces opposed and their marginal ortions secured to one another, a diaphragm isposed between the plates and'included in the connection thereof, one of said plates havin a central opening, a casing secured to said p ate about the edgesrof the opening and havin a bore ali 'ng with the o ening, a valve ody slidab y fitting in said ore and connected to the diaphragm, said valve body having a transverse port, the casting having a port with which the ort of the va ve body is ali able when the iaphragm is flexed in one irection, and means for connecting a conduit to one end of the port of the body, said conduit being ada ted for communication with the interior 0 the intake manifold of the engine, the opposite end of the port of the body being in communication with the atmos here.

2. thermostatically controlled mechanism for the admission of air to the intake manifolds of internal combustion engines, a

7 pair of oppositely dished plates having their 4 diaphragm and sai concave faces opposed and their marginal gortions secured to one another, a diaphragm isposed between the plates and included in the connection thereof, one of said plates having a central opleninig, a casting secured to said late about t e e ges of the openin and avm valve ody slidab fitting in said ore and connected to the diaphragm, said valve body having a transverse port, the castin having a port with which the ort of the va ve body is alignable when the iaphragm is' flexed in one direction, and means for connectin a conduit to one end of the ort of the bofy, said conduit being adapte for communication with the interior of the intake manifold of the en 'ne, the opposite end of the port of the b0 y being in communication with the atmosphere, through 1the space between the ate.

In testimony WhGI LOf I hereunto aflix my signature.

EMMETT G. GRAULHJICH.

a bore aligning with the o enlng, a 

